An FPGA implementation of SHA 3 using keccak function for 512 bit encryption

SHA-3 (Secure hash algorithm-3), originally known as Keccak is a cryptographic hash function selected as the winner of the NIST hash function competition. Hash functions have many applications in cryptography mainly in digital signatures and message authentication codes and in network security. Implementation of the main building block (compression function) for five different SHA-3 candidates on reconfigurable hardware is presented. Keccak is a hash function that based on the sponge construction. Keccak hash function has been submitted to SHA-3 competition. In this paper has implemented “SHA-3 512” hash function and high-throughput core designed to work in high clock frequency dedicated to ASIC or expensive FPGA (Spartan 3). Because in many systems for the entire chip the clock frequency is fixed.so even if the hash core can reach a high frequency it has to be clocked at a lower frequency.